Efficient Discovery of Spectrum Opportunities with MAC-Layer Sensing in Cognitive Radio Networks
IEEE Transactions on Mobile Computing
A survey of spectrum sensing algorithms for cognitive radio applications
IEEE Communications Surveys & Tutorials
Sensing-Throughput Tradeoff for Cognitive Radio Networks
IEEE Transactions on Wireless Communications
Spectrum sensing in cognitive radio networks: requirements, challenges and design trade-offs
IEEE Communications Magazine
Cognitive Wireless Mesh Networks with Dynamic Spectrum Access
IEEE Journal on Selected Areas in Communications
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Cognition and cooperation are two concepts closely connected in Cognitive Wireless Networks. In such distributed networks, where there is not any central node responsible for retrieving/forwarding the information from/to all the users, the monitoring of the spectrum availability must be carried out also in a distributed fashion. However, there exists a trade-off between the amount of monitoring information shared among the users and the overhead introduced to the network, particularly when users are equipped with a single antenna. As primary users may suddenly transmit on any licensed channel, all secondary users should monitor periodically alternative idle channels where to resume the ongoing communications in case such a situation occurs. In this paper we analyze the minimum spectrum monitoring frequency required for users to have a number of alternative idle channels.